/*
	Silkybox v1.0 - The ultimate lightweight Lightbox clone for Mootools 1.2 beta 2
	by Shen Zhenyu (http://www.tuchong.com) - MIT-style license.
	Inspired by the original Slimbox v1.41 by Christophe Beyls
	Inspired by the original Lightbox v2 by Lokesh Dhakar.
*/

var Overlay = new Class({
	overlay:new Element('div',{'class':'overlay'}).fade('hide'),
	showOverlay:function(options){
		options=Object.extend({duration:500,from:0,to:0.8},options||{});
		this.overlay.setStyle('height',Window.getScrollHeight()+'px').inject(document.body).set('tween',options);
		this.overlay.fade(options.to);
	},
	hideOverlay:function(){
		this.overlay.set('tween',{duration:500}).fade('out');
	}
});

var Lightbox = new Class({
	Implements : [Options, Overlay],
	options:{
		resizeDuration: 400,
		resizeTransition: false,	// default transition
		initialWidth: 250,
		initialHeight: 250,
		animateCaption: true,
		showCounter: true
	},
	initialize: function(els,options){
		this.setOptions(options);

		this.anchors = [];
		els.each(this.addAnchor,this);

		this.center = new Element('div', {'id': 'lbCenter', 'styles': {'width': this.options.initialWidth, 'height': this.options.initialHeight, 'marginLeft': -(this.options.initialWidth/2), 'display': 'none'}});
		this.image = new Element('div', {'id': 'lbImage'}).inject(this.center);
		this.prevLink = new Element('a', {'id': 'lbPrevLink', 'href': '#', 'styles': {'display': 'none'}}).inject(this.image);
		this.nextLink = this.prevLink.clone().setProperty('id', 'lbNextLink').inject(this.image);
		this.prevLink.onclick = this.previous.bind(this);
		this.nextLink.onclick = this.next.bind(this);

		this.bottomContainer = new Element('div', {'id': 'lbBottomContainer', 'styles': {'display': 'none'}});
		this.bottom = new Element('div', {'id': 'lbBottom'}).inject(this.bottomContainer);
		new Element('a', {'id': 'lbCloseLink', 'href': 'javascript:;'}).inject(this.bottom).onclick = this.overlay.onclick = this.close.bind(this);
		this.caption = new Element('div', {'id': 'lbCaption'}).inject(this.bottom);
		this.number = new Element('div', {'id': 'lbNumber'}).inject(this.bottom);
		new Element('div', {'styles': {'clear': 'both'}}).inject(this.bottom);

		var nextEffect = this.nextEffect.bind(this);
		this.center.set('morph',$extend({duration: this.options.resizeDuration, onComplete: nextEffect}, this.options.resizeTransition ? {transition: this.options.resizeTransition} : {}));
		this.image.set('tween', {duration: 500, onComplete: nextEffect});
		this.bottom.set('tween', {duration: 400, onComplete: nextEffect});

		this.preloadPrev = new Image();
		this.preloadNext = new Image();
	},

	addAnchor: function(el){// dynamicly add anchors after the page loaded.
		el.onclick = this.click.pass(el, this);
		this.anchors.push(el);
	},

	click: function(link){
		if (!link.rel) return this.open([[link.href, link.title]], 0);

		var j, imageNum, images = [];
		this.anchors.each(function(el){
			if (el.rel == link.rel){
				for (j = 0; j < images.length; j++) if(images[j][0] == el.href) break;
				if (j == images.length){
					images.push([el.href, el.title]);
					if (el.href == link.href) imageNum = j;
				}
			}
		}, this);
		return this.open(images, imageNum);
	},

	open: function(images, imageNum){
		this.showOverlay({to:0.8});
		document.body.adopt(this.center,this.bottomContainer);
		this.images = images;
		this.setup(true);
		this.top = window.getScrollTop() + (window.getHeight() / 15);
		this.center.setStyles({top: this.top, display: ''});
		return this.changeImage(imageNum);
	},

	setup: function(open){
		var elements = $A(document.getElementsByTagName('object'));
		elements.extend(document.getElementsByTagName(window.ie ? 'select' : 'embed'));
		elements.each(function(el){
			if (open) el.lbBackupStyle = el.style.visibility;
			el.style.visibility = open ? 'hidden' : el.lbBackupStyle;
		});
		var fn = open ? 'addEvent' : 'removeEvent';
		document[fn]('keydown', this.keyboardListener.bind(this));
		this.step = 0;
	},

	keyboardListener: function(event){
		switch (event.keyCode){
			case 27: case 88: case 67: this.close(); break;
			case 37: case 80: this.previous(); break;	
			case 39: case 78: this.next();
		}
	},

	previous: function(){
		return this.changeImage(this.activeImage-1);
	},

	next: function(){
		return this.changeImage(this.activeImage+1);
	},

	changeImage: function(imageNum){
		if (this.step || (imageNum < 0) || (imageNum >= this.images.length)) return false;
		this.step = 1;
		this.activeImage = imageNum;

		this.bottomContainer.style.display = this.prevLink.style.display = this.nextLink.style.display = 'none';
		this.image.fade('hide');
		this.center.className = 'lbLoading';

		this.preload = new Image();
		this.preload.onload = this.nextEffect.bind(this);
		this.preload.src = this.images[imageNum][0];
		return false;
	},

	nextEffect: function(){
		switch (this.step++){
		case 1:
			this.center.className = '';
			this.image.style.backgroundImage = 'url('+this.images[this.activeImage][0]+')';
			this.image.style.width = this.bottom.style.width = this.preload.width+'px';
			this.image.style.height = this.prevLink.style.height = this.nextLink.style.height = this.preload.height+'px';

			this.caption.set('html',this.images[this.activeImage][1] || '');
			this.number.set('html',(!this.options.showCounter || (this.images.length == 1)) ? '' : 'Image '+(this.activeImage+1)+' of '+this.images.length);

			if (this.activeImage) this.preloadPrev.src = this.images[this.activeImage-1][0];
			if (this.activeImage != (this.images.length - 1)) this.preloadNext.src = this.images[this.activeImage+1][0];
			if (this.center.clientHeight != this.image.offsetHeight || this.center.clientWidth != this.image.offsetWidth){
				this.center.morph({height: this.image.offsetHeight,width: this.image.offsetWidth, marginLeft: -this.image.offsetWidth/2});
				break;
			}
			this.step++;
		case 2:
			this.bottomContainer.setStyles({top: this.top + this.center.clientHeight, height: 0, marginLeft: this.center.style.marginLeft, display: ''});
			this.image.fade(1);
			break;
		case 3:
			if (this.options.animateCaption){
				this.bottom.get('tween').set('margin-top',-this.bottom.offsetHeight);
				this.bottomContainer.style.height = '';
				this.bottom.tween('margin-top',0);
				break;
			}
			this.bottomContainer.style.height = '';
		case 4:
			if (this.activeImage) this.prevLink.style.display = '';
			if (this.activeImage != (this.images.length - 1)) this.nextLink.style.display = '';
			this.step = 0;
		}
	},

	close: function(){
		if (this.step < 0) return;
		this.step = -1;
		if (this.preload){
			$(this.preload).removeEvents('load');
			this.preload = null;
		}
		this.center.style.display = this.bottomContainer.style.display = 'none';
		this.hideOverlay();
		this.setup(false);
		return false;
	}
});